In light of the above situation, it is natural to ask if we can access such NP effects of \(1\,\text{--}\,10\%\)  order at the large hadron collider (LHC) searches.
In Ref. [1]}, \(\tau + \text{missing}\)  searches by ATLAS [2]} and CMS [3]} have been applied to put the LHC bound on \(C_\text{NP}\)  in the \(b \rightarrow c\tau \nu \)  current.
Then, they found that the current LHC data constrains NP scenarios addressing the \(R_{{D^{(*)}}}\)  excesses.
See also Refs.[4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]} for the other studies.
One can think that the \(\ell + \text{missing}\)  search by ATLAS with \(139~\text{fb}^{-1}\)  [11]} can probe the LHC bound in \(b \rightarrow q \ell \nu \)  with \(q = c, u\)  as well.
